Apple is being sued by a man in Colorado over claims that the company’s $39 iPad Smart Covers violate a “Portable Computer Case” patent originally filed in 2003 and issued in 2005. PaidContentobtained a copy of the lawsuit.

The United States patent in question is 6,977,809. A Colorado man owns it, Jerald Bovino, who is seeking royalties for sales of Smart Covers’ using his invention. An excerpt from the patent seems to describe functionality that is quite similar to Apple’s Smart Covers—at least the ribbed design: